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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd3c3f1967c816229d1edd118eb38a722e17f1f1c0143b365051c0a8e9e39e1' 
  AND token = '5Lb9YEXOTmbpAXX5NGnM/tFxRmI1HRg7K7kR+nmIy58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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