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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39545ca020e382e5f04590f6516d2670476e397c9a8ec1ad826eeb627b58f5d' 
  AND token = '+91nbfrIe8Y5hT5Cl0Rp5k/JZ90LHI1Q9dDf7MyhXEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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