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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e606a7152d6abcfa14710ed80d9214fa4793ade6ce741192cf424d0e0812ec9' 
  AND token = 'nGRFEU62VhtubmLuN4kbL0574ZqfUFrw79UU9OjOKoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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