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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5412fdcacf7221c5bf8ba374aa2263d4c7cf342c5d679d8f23f1475293b56c74' 
  AND token = 'tS+ahSK6v+yltXGinV4nLkqFjbEPBkQ1SYm7Akt592E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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