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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14aee97d6b81b8bd5d2136a51d718eed34d50b2b37f596723649e0c94826e13' 
  AND token = 'WB2LLWAEuhTSyXiQEO8zX8X09N/GT1uexh67892tp4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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