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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9185d44aec3782ef407a249f602f6ed8edf0c9d187410ca379048102775b940' 
  AND token = 'lLb7Ph9FgI0Nk/HBranN3HXcqgzP6R7bo4CKcXUDW4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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