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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb93ccdbe34fc7148e173c0948e07c563c64185dc5ab789ed21d1c3e71c4b15' 
  AND token = 'MW0N8f3Ia2SnYYvJeGPFHSegxBlw4TCxJpQKoX+k2DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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