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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945b860933952166ce9c9496c333c7fa561ac7e099e65082f46a69497a7aea75' 
  AND token = 'bS8vmZPScUvsXyrMnqb6fFr3Qvuh/ysgHKX3BAIBEIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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