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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d66235fe2cd644da1df8e96e5ef7a97d4d8c7c89eceedf925b45e7abe41ae9a' 
  AND token = 'X+pJn5ojFQaSSlgux8U5BLBjaMNdqdD+Mo5JPoC1DVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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