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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777fac8425b5b8b32a2eaf05b53a032f79a62ce5afbe4e5d63be6d4ed3a86304' 
  AND token = '/BuuyyAKR58TTbTYprxSZ5V5sjwtrhzjdDJSS2HtcOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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