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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c09c9d1fe27f3160f02a965c0dad19be9f8dabbd7112c1ed41d46a2d2bbc81' 
  AND token = 'yzcypythTrzNyJPQnC7Er5CEiwi1zBVir/X6C+ZEAL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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