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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e419aed2960cfbde183798576f3a9b7b371a78c87e9a2edc0c10089614f64790' 
  AND token = 'C04cwUlxq3aRWVla3Bsr/BlKIbN3p8qnb0EqPlqVdqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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