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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c340ac9a51f9ea5cbfd414c3647ef25507b31239b41c3860fc16c2aa97d426' 
  AND token = 'X9ijLIxYKajPrT/67TXytPAMxC5XjCTJBfqjX+WV++U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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