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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283bf5f4d85fe43778da7b5a9826f998d4e3778ceea832d9f5b1e6b3b3d8d1c1' 
  AND token = 'canBSyz9mqWxS9JDPvaR6AQC0HsivxzByai8UYCx3qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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