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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8159da6b96561b76a0fac30278f2c6a7cfa4f94cc99715b90bc16281b32a4be' 
  AND token = 'FO1ERb5mI7d4FbblI0k4ky93npamojnzVRQw9xBbNkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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