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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c920aa4398b95b4068a22e5dc26230ca0bfabb2b1911ed08ac13f07435bf10' 
  AND token = 'uV936ECWRXrkujKrYjDRdf+1DQGfBl95XynwoAP0Pgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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