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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d1cd35ec2f6712beffd5704514d3bb46770ffadd183e4bee2bfb87b134c2c9' 
  AND token = '+C11qNx5t2y765srZ54QA5AQXdSmUNV1cFZ7gZtwX9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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