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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec248cbdabdd5266410cc2f80266f9f5c1ca64b83eb15f9671eca528a1a8f2f' 
  AND token = '6XR9ykWy/VMcXZUDigC6EN99GpxK/pmL5ugtqYBvqTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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