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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fdd60e68b330fb998dccc75a47e1837c92de83fcac1b62dd943331bf778a51' 
  AND token = '5ixHUOMZlVgFcNAh1GIuxg/LnXyb6goMtLRtdAd4XI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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