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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24acbe1a8e3600eddb44ddebbb0437bb9f206814f772b3667bdef88e6402a32' 
  AND token = 'hpUek3Fb2ekcQaXPU+PyAOUzZ+8XHM9O5ESey55z45A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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