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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4934053aa75d267315db879d97cbea4c3ea33ea21be32a06ae025a885ae22e61' 
  AND token = 'S9Pzf99/IcVgdzW9AZX6sB0yIdjltvM3ee7UVB2DFtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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