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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d74955de697100e3cb7fb9432385cb9f421ba0e80114a39ca96e64fb67624a' 
  AND token = 'JwScsCS1X9rAEQ7JIZcrsySaReJHI7N+e7yRmGVg9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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