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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83019139647aeff6b1096aba1d99190bec7359babf3d5620a3f38b04f5121ce1' 
  AND token = 'Cqfarxb6weZ9223BO0SwyVWw5FU9wyt0LUXi47tNIws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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