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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d3396b9e84d9df67fc5f0992c01a92231b4cef2832ec2a88b5b4de5cc47e87' 
  AND token = 'r3405iQAWFYuX1dT6HEBobKfHmonRfc3JFVUR59xcAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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