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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897fa94948e598fae88820494606e92aa2ce67e7c51f72bef7a9ad302dfeff02' 
  AND token = '1BMvvFbYCGcDcgwitU03X0FH9pV2jQOanNCQh/1VrS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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