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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c66660570f82bc76842a237c3c95a9e5017a3f260c38e773c6f5751cc4d5a0' 
  AND token = 'Jx85Fi5TKq8cFloWP1XvCWa7bxX7QxJVZhnk0ujdzec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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