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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a405f2eb615f0b562e89b1a7293ca11ac1a6576650d8c5de3b737d2ce2ba1ac3' 
  AND token = '+Q8fuW6H/rGDPejGgDKowDezaDFlVW4z57YPMk6RyQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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