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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b762a8baa599d1a2fef1c352801bad9472e54045fe90ba6e4bf2e2748382bfd' 
  AND token = 'MlegNah/i8f0g1MCMowmVMaSk7dX1SWzUmYYJZXQ9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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