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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241a7f42ff555d21c28b4e9654825ee0b515e650c2ee830a13d08c744e832cb9' 
  AND token = 'L7yXLH5DjxhTvVBEJ5KNyP/Pz66C+d4d26oNBido8f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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