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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd89dc38e7aba5d9a96eaa1a5ac1791375ef7fbcdf5b25960e9f82afc240cd4' 
  AND token = 'FuujOtGJRKFTX0iCnqnWqntcM3MMcuLH/OdwXG6JTmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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