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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24793fd3f9c2201b0e0e5ce75501f960a1fa00b003ebb16c21d53e471d9b7a2c' 
  AND token = 'LrM5xnNhWzzaunauHFZ6b7TnRvnEWyvlklcKh19/9c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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