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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1c1b29bd88949dbf6722be3f90c4a76e415e81bb7dfb92f4427966fb65c60e' 
  AND token = 'ADEeIgyK1c8t3TkEg2kTfO/AdVXGjo/euCPuCTcMO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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