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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960206a691fe1fc69c99ec768c82b5fd4e998045be1cbfdd58bfdd0820e357c7' 
  AND token = 'K1412MqvUyEs6kZGTvGoINSUfyP6x4X8zmyqm8phRLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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