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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e027783f05d73d21bf0f92faf45fd8688695763773f1ee51b0623b3659788d6' 
  AND token = 'rWaFd8bMA/WdjNgbkoQFlcjetagek/TOVivU68T6G1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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