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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b675c0e49e4f6e06efd5f8019e9fddf44f2e7a63e6031b324a2bd7becb27e8' 
  AND token = 'do/LJUXbJlJVSdg3I3WN63mX/t/uLQ86tY2hH2ExrKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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