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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b768765685a7da083ebe4ce414ef376a7b326ae49afe064cf26491e54e7cea61' 
  AND token = 'd4zM2PAi4HYXUfP9aXw2Rln2XfrCK36m52N7ADE2eZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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