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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007f9941c1ed7239437155fc56a160b1d6aafbe4b4e6eac4d4ff7fa9fc300343' 
  AND token = '32T6bA54H2BaLCx/QSmfK74DmivnmLjmf2xrFZ9MzGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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