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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fe7bca776a6942632e8ecc4f8127f7ed9538a60f3cfc7c14b0c0815700880f' 
  AND token = 'Ohb7bphCCES3Kf6TFFK2FXalqt26rfnEdNPWIS+dWas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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