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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b440dbcb04e9a34420550ea96292fd320f2a28dc2653e65caa340fc0883c056f' 
  AND token = 'ZLZZ9X37JezqEXEJEvObScnK6FjPcoB+hl1Hv3ULr7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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