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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c039c2c2406b11cb033bc15e7f798017c864b9d9feae6e925d248ce39436c4' 
  AND token = 'V7qYylODPE8qOmqug7E+00sIYseA++teLRZ0WKJSeoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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