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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e8e0c318aa7b443cabe5aad9ec6df44c338c0879f411bd0a4efda6c5236132' 
  AND token = 'm94s2dLMAlr7RqdE68ZrjPhRYY/hTHyjv6rinluiS90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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