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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4842cb6327fd422b7ad4676fc14d56b09814e4c90ebba558baf6974960d8daa3' 
  AND token = 'pXt61mcC8C+k/38BvGW8btenh/9+cLdV+kjFWiALkx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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