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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc753d4f7437fb84d1bf5253fea883a7a9d8c899b5eab13644cacbf2aae0dbf7' 
  AND token = 'Gkp5rikthQ7Ev6GkPMHc4nAhxBlkL/64LEQjvABnL00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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