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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb525393570e75891337ff3e3e825c1ac42a6c54260600d08a3738cc4bd1b75a' 
  AND token = 'e+c4Wx1Q9R8EQlVA2M6NsZFcJ1Tz5lCgP6kg0Pu0mYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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