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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a8bbec01d9f933c88cfd881534759bd407becd243c2b2fd7eba0915e8ef658' 
  AND token = 'GncjHs4Xr39zLAphR/jksyhBfAllocgt+G+JjMlR15s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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