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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821476a0888e82590e9e48f403af87ae9a51458a1136a525addc3e2ac4524d44' 
  AND token = 'vgjOH2MbtMn6LShpYSt1jbs3Vrnu523iqoRYetBxmbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}