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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c237a0703dc584d1bd6b3b266eacf1223a051f20aaa68bec3fcb91ddcad3e61' 
  AND token = 'Yzjqadfpv7Acd/78u5wsxTCyEQP4NggxP0QWtec6k8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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