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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4877cf5d56c4e8c22436cc4296acd15773b86b6d9c1ec15a1f324c850d6c7d0' 
  AND token = 'mMqnh4CkqQoHkes3Za5lXUq5SPuHApQzAg4uMrcngVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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