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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fd684a408346bb2960992d6be2b8d1211743956100669a27a59ace44195cec' 
  AND token = '0uLlVsEZcA0gjn4eDsFSVmpMyi56IUTNu9EgZXdcsA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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