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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302d08d9b81838006f4a559cfd19a7e552f597168bf931ccf4406819548cc17d' 
  AND token = 'I7+5kQWrJP+zXZev9GjHPeBpfcfxHatXDv4TuOO2pzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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