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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f255a27158f7c5e4e61a5f4d225c47bdd1d5bc26a0cab22183908500d11a3b' 
  AND token = 'dMKi11+tLK3gY030MpnuqWzITWUeMZcUKHpmeKBwXTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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