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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bb52b26c143cd4ed831d6b42c3623d8bec8fb13d27f8cb7e12585a243d333e' 
  AND token = '4LdZQXi4e0yq4DjnN21ZrbLVbIkdU3hiTrcz1ps+LtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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