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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f8cb34c8d5a252905e12b48119dab3b1d67233355f5d4115f44923e6c69d60' 
  AND token = 'xu5a4cqOWKQAvZUWxZ7vUo9MpG0Bcmx3+eyteU6fKOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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