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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8f246a0a99bb604053a96a140f3596a2b2419ba7f8132dd47107a53fd67ac4' 
  AND token = 'hmo18uNbFzJQXxt6A397m4nNMJatAM1oYqgce6Yxbpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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