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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36dfec1c2043abce03f0126410d4b53210f5ed9f9cd978ed280895b3b45cbe4' 
  AND token = 'ow47OiHKGsufB+xTBHAmaWwdSMXO0L497XSSdsDVJy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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