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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b703d56881fced11bc5b9c9ae6b299229b95334e55de4057cdd7a861b479a542' 
  AND token = 'Q8ZHJsJJ6fY3GDqJZybvEueFXFKrfXHMVS6jS2e2xEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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